KOBAYASHI Shuji f4b528e07a Support -- (end of options) to mruby command ...

#### Before this patch:

  ```
  $ bin/mruby -e 'p ARGV' -- -x
  bin/mruby: invalid option -- (-h will show valid options)
  ```

#### After this patch:

  ```
  $ bin/mruby -e 'p ARGV' -- -x
  ["-x"]
  ```

2019-11-27 19:51:43 +09:00

..

mruby.c

Support -- (end of options) to mruby command

2019-11-27 19:51:43 +09:00